Carbon dots decorated hierarchical litchi-like In2O3 nanospheres for highly sensitive and selective NO2 detection

Cheng, Ming; Wu, Zepei; Liu, Guannan; Zhao, Lianjing; Gao, Yuan; Li, Shan; Zhang, Bo; Yan, Xu; Lu, Geyu

doi:10.1016/j.snb.2019.127272

Cited by 61 publications

(34 citation statements)

References 62 publications

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“…Synthesis and Structural Analysis. The XRD technology was applied to detect the crystal structures and phase purity of all of the prepared samples with the scanning of diffraction 222), (400), (332), ( 431), (440), and (622) planes, respectively, 43 while the XRD pattern for Ag shows a diffraction peak at 38.116°, which is attributed to the (111) planes. 30 The morphologies of the samples were surveyed by SEM, as shown in Figure 2b−e.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Phenylalanine Dipeptide-Regulated Ag/In₂O₃ Nanocomposites for Enhanced NO₂ Gas Sensing at Room Temperature with UV Illumination

Ying

Feng

et al. 2021

ACS Appl. Nano Mater.

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This work demonstrates that phenylalanine dipeptide-regulated silver can improve the gas sensing performance of a nitrogen dioxide (NO 2 ) gas sensor. Herein, Ag/In 2 O 3 was prepared by a hydrothermal method to detect NO 2 gas, where varying amounts of phenylalanine dipeptide (FF) were introduced to regulate the growth of Ag NPs. The morphologies, microstructures, and compositions of the obtained samples were characterized in detail, and the results indicate that Ag NPs grow into nanorods with the regulation of FF. The gas sensing characteristics were systematically investigated with UV illumination (365 nm) at room temperature (25 °C). Upon exposure to NO 2 gas, the optimal sensor exhibits a relatively high response value, good linearity, and satisfactory stability. In addition, the sensor can maintain good gas sensing performance under varying humidity. The reason underlying the observed enhancement in the gas sensing property is the formation of more active sites with the Ag nanorod structure. This study suggests that the introduction of polypeptides is a promising idea to improve the performance of gas sensors.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Phenylalanine Dipeptide-Regulated Ag/In₂O₃ Nanocomposites for Enhanced NO₂ Gas Sensing at Room Temperature with UV Illumination

Ying

Feng

et al. 2021

ACS Appl. Nano Mater.

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“…Figure 2 a shows that spherical CDs with a uniform diameter of ~6.3 nm were synthesized by the precursor pyrolysis method. The high resolution TEM image (inset) shows the lattice fringes of a CD, whose d -spacing value is 0.21 nm, indicating the (100) lattice structure [ 1 ]. The CDs were further characterized by a wide-angle X-ray diffraction (XRD) pattern ( Figure 2 b).…”

Section: Resultsmentioning

confidence: 99%

“…Here, strands of SWCNTs decorated with lots of CDs are clearly seen, verifying the successful decoration of SWCNTs with CDs. Because there is no chemical interaction between CDs and SWCNTs, the CDs are weakly bound to SWCNT walls by van der Waals forces [ 1 ]. Considering that the SWCNTs with diameters of 1.2–1.7 nm were initially used, the diameter of ~15 nm in the TEM image was obtained as a bundle of SWCNTs, but not an individual SWCNT (TEM images of the SWCNTs before and after CD decoration are compared in Figure S2 ).…”

Section: Resultsmentioning

confidence: 99%

“…Through the results, it can be predicted that the active surface coverage is gradually saturated by NO 2 molecules at concentrations above 2.0 ppm, and the number of vacant adsorption sites thus decreases. From the curve, the sensor’s limit of detection (LOD) was theoretically calculated to be 18 ppb [ 1 , 45 ] (see Figure S5 for more information).…”

Section: Resultsmentioning

confidence: 99%

“…As hazardous gases, nitrogen oxides (typically, NO and NO 2 ) are mainly generated by combustion processes of fossil fuels, such as vehicle exhausts, power plants, and various industrial processes, and are the main causes of acid rain and photochemical smog, having a significant influence on air, water, and soil pollution [ 1 , 2 , 3 ]. Furthermore, the gases can cause serious problems to human organisms, irritating eyes, causing dizziness, and chronically weakening the respiratory system.…”

Section: Introductionmentioning

confidence: 99%

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Negatively-Doped Single-Walled Carbon Nanotubes Decorated with Carbon Dots for Highly Selective NO2 Detection

2020

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In this study, we demonstrated a highly selective chemiresistive-type NO2 gas sensor using facilely prepared carbon dot (CD)-decorated single-walled carbon nanotubes (SWCNTs). The CD-decorated SWCNT suspension was characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), and UV-visible spectroscopy, and then spread onto an SiO2/Si substrate by a simple and cost-effective spray-printing method. Interestingly, the resistance of our sensor increased upon exposure to NO2 gas, which was contrary to findings previously reported for SWCNT-based NO2 gas sensors. This is because SWCNTs are strongly doped by the electron-rich CDs to change the polarity from p-type to n-type. In addition, the CDs to SWCNTs ratio in the active suspension was critical in determining the response values of gas sensors; here, the 2:1 device showed the highest value of 42.0% in a sensing test using 4.5 ppm NO2 gas. Furthermore, the sensor selectively responded to NO2 gas (response ~15%), and to other gases very faintly (NO, response ~1%) or not at all (CO, C6H6, and C7H8). We propose a reasonable mechanism of the CD-decorated SWCNT-based sensor for NO2 sensing, and expect that our results can be combined with those of other researches to improve various device performances, as well as for NO2 sensor applications.

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Room‐Temperature NH₃ Sensor Based on SnO₂ Quantum Dots Functionalized SnS₂ Nanosheets

Bai

Shen

Zhao

et al. 2023

Adv Materials Technologies

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Traditional metal oxide semiconductor gas sensors are facing significant challenges for portable devices and integration due to large power consumption caused by high working temperature. 2D nanomaterials with large specific surface areas, rich active sites, and tunable electrical properties are proved to be promising candidates for room‐temperature gas sensors. However, several disadvantages including weak response, sluggish response/recovery kinetics, and poor selectivity still need to be overcome for high‐performance gas sensors. Herein, SnO2 quantum dots (QDs) with a diameter of ≈3 nm functionalized SnS2 nanosheets with a thickness of ≈17 nm are synthesized via a two‐step solvothermal method, which exhibits a high response of 11.1 to 100 ppm NH3 at room temperature of 25 °C with fast response speed and good repeatability, high selectivity, and long‐term stability. The sensing mechanism is mainly ascribed to 0D/2D heterostructure, synergistic effect, and n‐n heterojunction constructed across the interfaces between SnO2 QDs and SnS2 nanosheets. The as‐prepared nanomaterials may contribute to the reasonable design of heterostructure between 0D QDs and 2D nanomaterials, and offer a promising candidate for room‐temperature NH3 detection.

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Carbon dots decorated hierarchical litchi-like In2O3 nanospheres for highly sensitive and selective NO2 detection

Cited by 61 publications

References 62 publications

Phenylalanine Dipeptide-Regulated Ag/In₂O₃ Nanocomposites for Enhanced NO₂ Gas Sensing at Room Temperature with UV Illumination

Phenylalanine Dipeptide-Regulated Ag/In₂O₃ Nanocomposites for Enhanced NO₂ Gas Sensing at Room Temperature with UV Illumination

Negatively-Doped Single-Walled Carbon Nanotubes Decorated with Carbon Dots for Highly Selective NO2 Detection

Room‐Temperature NH₃ Sensor Based on SnO₂ Quantum Dots Functionalized SnS₂ Nanosheets

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Carbon dots decorated hierarchical litchi-like In2O3 nanospheres for highly sensitive and selective NO2 detection

Cited by 61 publications

References 62 publications

Phenylalanine Dipeptide-Regulated Ag/In2O3 Nanocomposites for Enhanced NO2 Gas Sensing at Room Temperature with UV Illumination

Phenylalanine Dipeptide-Regulated Ag/In2O3 Nanocomposites for Enhanced NO2 Gas Sensing at Room Temperature with UV Illumination

Negatively-Doped Single-Walled Carbon Nanotubes Decorated with Carbon Dots for Highly Selective NO2 Detection

Room‐Temperature NH3 Sensor Based on SnO2 Quantum Dots Functionalized SnS2 Nanosheets

Contact Info

Product

Resources

About

Phenylalanine Dipeptide-Regulated Ag/In₂O₃ Nanocomposites for Enhanced NO₂ Gas Sensing at Room Temperature with UV Illumination

Phenylalanine Dipeptide-Regulated Ag/In₂O₃ Nanocomposites for Enhanced NO₂ Gas Sensing at Room Temperature with UV Illumination

Room‐Temperature NH₃ Sensor Based on SnO₂ Quantum Dots Functionalized SnS₂ Nanosheets